1.0 Installation Wiring

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Norman Robbins
5 years ago
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2 1.0 Installation Wiring DX Firebox is designed to be an electronic replacement for Pontiac & Ford buzz coils when operated on DC. Installation may be positive or negative ground. Simply observe the RED and BLACK terminals with respect to battery polarity. Installation Wiring DX Ignition Page 2

3 When wiring the input connections use at least 16ga stranded wire, 10 amp fuse, and ignition switch. Grounding is very important; make sure the engine and battery have good chassis connections. It is recommended to test and inspect timer points for proper electrical ground connection to engine. The timer condenser is not required for the operation of DX ignition and it may be removed. If the condenser is good, you may choose to leave it connected allowing an easy switch between DX ignition and original buzz coil. For the best performance clean and gap timer points. Follow the procedure defined by Fairmont to adjust the timer points interval to 1/12 of an engine revolution which is the equivalent of 30. The timer interval determines the number of crankshaft rotation degrees the buzz coil will fire. Significantly less than 30 may cause high RPM stalling, spark plug fouling and slow timer lever response. Greater than 30 effectively advances the ignition timing with relationship to timer lever position. You may remove the 4 brass screws and lid to observe the red LED on the electronic buzz coil. The LED illuminates when the points are closed. The spark plug wire must be resistive or suppression wire. Due to the DX ignition high output copper or steel core plug wire should not be used because it may act as an antenna causing RFI and unwanted noise. The recommended spark plug gap is Resistor or non-resistor spark plugs may be used; however non resistor plugs may contribute noise to other electronic devices. DX Ignition Page 3

4 Ignition Timing Degrees 2.0 Specifications Operating Temperature Input Voltage On Current Output Voltage Oscillator frequency Dwell Spark Duration 0 F-120 F typical (all components exceed 220 F) v Positive Ground <1.5amp average/5.2amp peak >30kv peak 260Hz 3 milliseconds 1.6 millisecond 15 Ignition Timing vs RPM 3.0ms dwell Engine RPM The above chart shows the relationship between ignition timing and RPM with the timer lever in the center or vertical position. At 100 RPM the timing is 13.2 advanced and at 2000 RPM the timing is retarded 21. This is why the timer lever needs to be pulled back when starting the engine and pushed forward when running at higher RPM. DX Ignition Page 4

5 DX Firebox Schematic DX Ignition Page 5

6 3.0 Glossary of Terms High Tension High Voltage, voltage is electric tension measured between two points. Low Tension Low Voltage, voltage is electric tension measured between two points. Dwell Time Dwell refers to the time the ignition coil is charging. Negative Ground A negative ground system has the negative terminal of the battery connected to a common point such as a vehicle chassis to provide the same potential throughout the vehicle. Positive Ground A positive ground system has the positive terminal of the battery connected to a common point such as a vehicle chassis to provide the same potential throughout the vehicle. Positive ground potential promotes galvanic corrosion on vehicle body parts and frames and is not commonly used today. The electrical wiring itself is sacrificed however better insulation offers protection and reduces deterioration. Spark Plug Heat Range The heat range of a spark plug determines the temperature of the tip of the spark plug while the engine is running. The correct temperature maintains efficiency and keeps the plug clean. The temperature range does not significantly affect electrical characteristics of the plug. Timer The timer is a cam actuated mechanical device that provides a signal to a buzz coil. Points Points are a cam actuated mechanical switch that provides a signal to an ignition coil. Condenser The condenser is a capacitor that connects to ignition points. The function of the condenser is to provide a path for the collapsing magnetic field of the primary side of an ignition coil when the points open. Average Current Current measured with respect to time. Peak Current Current measured at its maximum value. Ignition Coil A device with a pulsing low voltage DC input and a high voltage output. Ignition Module The primary function of an automotive ignition module is to interpret incoming cam or crank shaft signals and deliver a pulsed regulated current flow to an ignition coil corresponding to engine position. DX Ignition Page 6

7 Coil Primary Inductance Inductance measured on the primary or low voltage input side of an ignition coil. Inductance unit of measure is henrys. Typical ignition coil primary inductance ranges between 1-10mh (millihenry). Primary Resistance Resistance measured on the primary or low voltage input side of an ignition coil. Resistance is measured in ohms. Typical coil primary resistance ranges between ohms. Secondary Resistance Resistance measured on the secondary or high voltage output side of an ignition coil. Typical coil secondary resistance ranges between 5K-10K ohms. Coil Turns Ratio Coil turns ratio refers to the number of winding on an ignition coil primary and secondary. Typical coil ratio is 1:100. RFI Radio Frequency Interference or Electromagnetic Interference Resistor or Suppression Wires Suppression spark plug wires have internal resistance that reduces the emission of RFI. Resistor Spark Plug A spark plug with internal resistance reduces the emission of RFI. Ignition Timing Ignition timing on an internal combustion engine determines when an ignition spark is initiated based on the position of mechanical components of the engine. Ignition Coil Polarity A typical ignition coil generally can operate polarity in either direction. When the polarity of the primary side of an ignition coil is reversed the output reverses respectively. Spark Polarity The polarity on the secondary side of an ignition coil determines the direction of high voltage electron flow. The ideal direction for a spark plug is for the spark to jump from the center electrode to the ground electrode. On a single coil two cylinder ignition system one spark plug always fires in reverse polarity. Polarity In a Direct Current circuit electrons flow in one direction from the negative pole to the positive pole. Identifying the poles identifies the polarity. When the poles are reversed the polarity is reversed. Inductance The current flowing through a conductor induces a magnetic field around the conductor. The voltage across an inductor is equal to the product of its inductance and the time rate of change of the current through it. Inductance is measured in henry. DX Ignition Page 7

Contact Information Brett Scott 204 S. 5 th street Ethan, SD 57334 (605)227-4693 Email: bscott@santel.net 4.

When installing, operating, or servicing the electronic buzz coil use extreme care and recognize the high voltage

Interrupting the high voltage path poses a health risk and also possible damage to the buzz coil.

8 Contact Information Brett Scott 204 S. 5 th street Ethan, SD (605) bscott@santel.net 4.0 Operation & Precautions Warning High Voltage! When installing, operating, or servicing the electronic buzz coil use extreme care and recognize the high voltage potential. Important! Do not operate the electronic buzz coil without a defined high voltage path! Interrupting the high voltage path poses a health risk and also possible damage to the buzz coil. The High voltage path must be a complete circuit from the coil tower to ground. A failed or disconnected plug wire can cause the spark to arc internal to the coil causing failure. One year warranty from purchase date. Purchase Date Rev. 9/6/2017 DX Ignition Page 8

Contents. DX Ignition Page 2

Contents. DX Ignition Page 2 Contents 1.0 Intent 2.0 Specifications 3.0 Installation 4.0 Operation Precautions 5.0 Repair 6.0 Parts List 7.0 Glossary of Terms 8.0 Contact Information DX Ignition Page 2 1.0 Intent The purpose of this